The invention provides a measuring device for deformation of a vehicle opening. The measuring device is arranged along a diagonal line of the opening, and the two ends of the measuring device are fixedly connected with a flange of the opening separately; the measuring device comprises a fixed bracket, a displacement sensor, a measuring steel wire and a clamping assembly; one end of the measuring steel wire is fixedly connected with a self-resetting sliding rod of the displacement sensor, and the other end of the measuring steel wire is fixedly connected with the clamping assembly; the displacement sensor is fixed to the fixed bracket, the fixed bracket and the clamping assembly are respectively positioned at the two ends of the diagonal line of the opening, and the fixed bracket and the clamping assembly are fixedly connected with the flange of the opening separately. According to the measuring device for the deformation of the vehicle opening, by utilizing the cooperation between thesteel wire and the displacement sensor, the deformation amount of the opening is recorded, and the device is applicable to measurement of the deformation amount of openings with different sizes.